Data compression is the process of encoding information using fewer bits than the original representation would use. Like the compression of images, it reduces the size and quality of the data which could then degrade the quality. Essentially, it is the process of encoding large files in order to shrink them down in size.
Data compression ratio is a term used to quantify the reduction in data-representation produced by a data compression algorithm. The compression ratio is:
compressed size
uncompressed size
(compressed size over uncompressed size)
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